Watch movement with a central seconds hand



Sept. 15, 1959 J. BAMAT 2,903,846

WATCH MOVEMENT WITH A CENTRAL SECONDS HAND Filed April 27, 1956 Illn United States Patent O WATCH MGVEMENT WITH A CENTRAL SECONDS HAND Joseph Bamat, Granges, Switzerland, assignor to Amida S.A., Granges, Switzerland, a Swiss iirm Application April 27, 1956, Serial No. 4581,212

Claims priority, application Switzerland May '13, 1955 1 Claim. (Cl. `58--59) My invention has for its object a watch movement with a central seconds hand of the type in which the center wheel is eccentered. According to my invention, the center wheel controlling the seconds wheel through the agency of an intermediate wheel and of a third gear is located partly between a surface of the barrel and the finishing plate while the toothed wheels rigid respectively with the third gear and with the seconds gear are located in the same plane as the center wheel.

I have illustrated by way of example in the accompanying drawings a preferred embodiment of my improved movement. In said drawings:

Fig. 1 is a diagrammatic plan View of a movement as seen from the bridge side.

Fig. 2 is a cross-section through line II-II of Fig. l.

In the example illustrated, the teeth 1 on the barrel drum 2, the arbor 3 of which is revolubly fitted in the plate 4 and in the barrel bridge 5 mesh with the center pinion 6. Said pinion is rigid with the corresponding toothed wheel 7 which forms the center wheel and is housed in the gap extending along the dot and dash line M between the upper surface of the barrel drum 2 and the finishing bridge 8. The wheel 7 meshes with the pinion 9 of the intermediate gear the wheel 10 of which drives a third gear including a Wheel 11 meshing with a wheel 12 of the central `seconds gear rigid with a small spindle 13 carrying the seconds hand which is not ilustrated. The wheel 12 controls the escapement wheel 14.

The spindles carrying the center gear 6 7, the intermediate gear 9-10 and the third gear 11 are revolubly carried between the plate 4 and the finishing bridge 8.

2,903,846, Patented Sept. 15, 1959 ICC The center wheel 7, the wheel 11 of the third gear and the wheel 12 of the central seconds gear are all located in a same medial plane M extending between the barrel drum 2 andthe finishing bridge 8 at small distances from said latter parts. It is thus possible to use to the utmost the available height above the barrel drum whereby a very fiat watch movement is readily obtained.

Since the seconds Wheel 12 is the fourth gear in the gearing 6-7, 9-10, 11 and 12, controlled by the barrel drum 2, said seconds wheel 12 will revolve in the same direction as the barrel which revolves against normal. Its winding up requires therefore a transmission including two knob-controlled wheels 16 and 17.

The teeth 1 of the barrel also control through a trictional transmission a motion work wheel which is not illustrated and which meshes with a cannon wheel carrying the minute pinion 18 while a pinion rigid with the said motion work wheel drives the hour wheel 20. The cannon wheel 18 is revolubly mounted on a pipe 21 fitted with a force tit intol the plate 4.

What I claim is:

In a watch movement, the combination of a iinishing bridge, a barrel drum facing the latter with a gap therebetween, a center wheel engaging partly the gap between the barrel drum and the iinishing plate, a spindle carrying said center wheel and controlled by the barrel, an intermediate gear including a wheel and a pinion meshing with the center wheel, a third pinion meshing with the intermediate gear, a third wheel coaxially rigid with the third pinion and extending entirely outside the transverse bulk of the barrel drum and a central seconds wheel controlled by the third wheel, and lying substantially in the same plane as the center wheel and the third wheel.

References Cited in the le of this patent UNITED STATES PATENTS 2,781,630 Bamat Feb. 19, 1957 FOREIGN PATENTS 125,517 Switzerland Apr. 16, 1928 206,229 Switzerland May 1, 1940 262,327 Switzerland Sept. 16, 1949 

